/*
 * Copyright (c) 2011, Yawning <yawninglol at gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   * Neither the name of the Mew Developers nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package yawning.mew.util;

import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.io.StringReader;
import java.util.List;

public class CSVDumper {
	// XXX: Some day I may want to dump things other than ints.
	public static void dump(String fileName, String header, List<double []> backingStore) {
		if (fileName == null) throw new RuntimeException("Invalid filename provided");

		// Do everything in core, before dumping to a file.
		StringBuilder output = new StringBuilder();

		if (header != null) {
			BufferedReader reader = new BufferedReader(new StringReader(header));
			String hl;
			try {
				while ((hl = reader.readLine()) != null)
					if (hl.length() > 0)
						output.append('#').append(' ').append(hl).append('\n');
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		for (double[] row : backingStore) {
			StringBuilder srow = new StringBuilder();
			for (double sample : row) {
				srow.append(',').append(sample);
			}
			output.append(srow.substring(1)).append('\n');
		}

		PrintStream out = null;
		try {
			out = new PrintStream(new FileOutputStream(fileName));
			out.print(output.toString());
		} catch (Exception e) {
			throw new RuntimeException(e);
		} finally {
			if (out!= null) out.close();
		}
	}
}
